Axle for multiple-drill-disk bits



jam 3L Q28 LSTG@ C. 5. GRCKVF AXLE FOR MULTIPLE DRILL DsK'BITS Filed Oct. 2l, 1925 2 Sheets-Sheet l c. s, CRICKMER AXLE FOR MULTIPLE DRILL DISK BITS Filed Oct. 21, 1925 2 Sheets-Sheec 2 Fatented Jan. 31, 1928.

`UNITED STATES -Pa TENT OFFICE.

CHARLES S. CRICXMER, 0F.DALLAS, TEXAS, ASSIGNOR T0 THE GUIBERSON CORPORA- TION, 0F DALLAS, TEXAS, A CCRPORATION OF DELAWARE.

AXiLE FOR MULTIPLE-DRILIi-IKDISK BITS.

Application led October 21, 1925. Serial No. `645,017.

rThis invention relates to new and useful improvements in axles for multiple drill disk bits.

The object of the invention is to. provide an axle having journals for supporting' circular cutter disks in such relation that when revolved said disks Will travel\.in relatively eccentric orbits; whereby .the disks are caused to undergo a shearing action to'dislodge cuttings and mud therefrom and to be self-cleaning- Another object of the invention is to provide supporting trunnions at each end of the axle concentric to the contiguous journals, whereby said axle is balanced and held against revolution.

A further object of the invention is to so dispose the eccentric journals that their greatest projection will be forward, thus enhancing the shearing action in the region of the cutting operation.

A construction designed to carry out the invention will be hereinafter described, together with other features of the invention.

The invention will be more readily understood from a reading of the following specilication and by reference to the accompanying drawings, in which an example of the invention is shown, and wherein: Y

Fig. 1 is a vertical sectional View of a multiple disk drill bit equipped with an axle constructed in accordance with my invention,

Fig. 2 is an underside View partly in section,

Fig. 3 is a side elevation of the axle in the position it occupies in the bit,

Fig. 4 is a plan View of the same,

Fig. 5 is an end elevation ofthe axle,

Fig. 6 is a partial vertical sectional view of a modified form of bit and axle,

I Fig. 7 is an underside view of the same,

Fig. 8 is a side view of the axle in its operative position,

Fig. 9 is a. plan view of the same,

Fig. 10 is an end elevation of the axle, and,

Fig. 11 is a detail of the tongue and axle mounting.

In the drawings the numeral 10 designates a bit stock or body of suitable shape. The stock is formed with a transverse vertical and diametrical socket 11 having its side walls converging upwardly to forma wedge shape. The upper Wedge shaped end 12 of a flat tongue 18 is driven into the socket 11.

While the tongue is shown as detachable from the stock it could be made integral therewith.

On each side of the stock are provided -seats 14 in which cheek plates 15 are suitably E fastened. These plates depend on each side of the tongue and form hangers for the outer ends of the,h axles 16. hIt is obvious ,that the particular structure of the plates and the manner of securing them to the stock and of fastening them in place is subject to considerable variation and modification.

The essence of the invention lies in the axle and its particular features whereby it carries out the objects of the invention, to do which it must only be associated with suitable co-act-ingparts. In the bit illustrated a pair of axles is shown and a description of a single axle will explain the individual fea Ytures of both.

The axle illustrated is arranged for suporting three circular cutting disks 18 on journals 17, but in carrying out the invention any suitable number of disks and journals may be used. The disks are graduated in diameter, the outer disk being the largest and the inner disk the smallest. The jour- .nals are made in the form of cylindrical collars and are graduated in diameter to correspond to the disks. An outer trunnion 19 projects from the outer collar in concentricA relation thereto and fits snugly in a socket 2O in the inner Side of'the hanger 15. A smaller trunnion 22 extends concentrically from the innercollar and lits' in` anv aperture 23 in the tongue 13.

The coll-.irs are disposed in eccentric relation to each other,'all having 'their greatest projection on the advance side of the axle; whereby the greatest radius of each collar lies in a horizontal plane co-incident with the axis of the axle. undergo its greatest thrust or relative displacement at substantially its point of contact with the wall of the hole being drilled. Thus cuttings lodging between the disks will j be carried away from such points and are ,prevented from lodging between said disks.

This eccentric mounting of the disks causes -them to move radially of each other and this tends to displace radially any drillings, rocks or other obstructions lodging tl1erebetween:

Each trunnion 22 has a flat side 24 (Figs.

This causes each disk to located. The axles 5, 10 and 11) and when assembled in "the bit, the axles are placed with their flat sides in contact and inserted in the aperture. This disposes the axles substantially parallel and extending oppositely from the sides of the tongue. rThis arrangement also positions the axles with 'their collars properly have little tendency to revolve owin to the fact that the intermediate collar 1s balanced between the inner and outer collars, which are concentrically supported.

The paralleljaxles are offset laterally and the active cutting edges of the disks when in engagement with the walls ol the holes are 'stepped oil. This prevents dragging and aids in giving traction to the disks.

This axle is designed particularly to be used in connection with loosely mounted cutting disks. In Figs. 1 to 4 inclusive I have shown the journals or collars cylindrical aces 17 and the disks with hubs having curvilinear or convex bores 18 whereby said disks are caused to wobbleor oscillate as they revolve. The structure and function of these disks is fully described in my co-pendng applications Serial No. 36,025 and Serial No. 56,212. In Figs. 6 to 9 inclusive I have shown a reversal in that the collars have curvilinear faces 17a andthe hubs ot' the disks have cylindrical bores 18a.

It is pointed out that each axle'lias its ends adequately supported in the hangers 15 and the tongue 13 and should the axle break, the roximity of the parts is such that the severe portions would not be displaced from the bit and would be recovered when the bit was withdrawn from the hole. As the axles do not revolve or rotate they do not require oil lubrication and as the disks are loose yon the axles, the Water and slush at the bottom of the hole will cool and lubricate them, however the heat will be negative on account of the loose mounting and the free turnin of the disks. l

Various c anges'in the size and shape of the different parts, as well as modifications r collars is in a common 17 formed with' and alterations may be made within the scope of the appended claims.

What I claim, is:

l. ln axle for a multiple disk drill bit comprising a plurality ci circular bearing collars eccentrically disposed and having their greatest projection on the same side 0i the axle, said collars being graduated in diameter and successively located, and trun nions extending concentrically from the end collars of the axle.

2. An axle for a multiple disk drill bit comprising, a plurality ot' circular bearing collars eccentrically disposed with relation to each other, each Vcollar having its greatest projection, with relation to the other collars, in a direction common to the greatest projection oi" the other collars, whereby the greatest throw 0i members revolving on said direction.

3. An axle for a. multiple disk drill bit comprising, a plurality ot circular bearing .collars eccentrically disposed with relation to each other, each collar having its greatest projection, with relation to the other collars, in a -direction common to the greatest projection of the other collars, whereby the greatest throw of members revolving on said collars is in a common direction, and trunnions at each` end of the axle.

4. An axle for a multiple disk drill bit comprising, a plurality ot' circular bearing collars eccentrically disposed with relation to each other, each collar having its greatest projection, with relation to the other collars, in a direction common to the greatest pro jection of the other collars, whereby the greatest throw of members revolving on said collars 1s in a common direction, and trunnions at each end of the axle, each trunnion i being concentric to its adjacent collar.

5. An axle for a pluralit of revoluble disks comprising eccentric caring collars each having its bearing face transversely curvilinear.

In testimony whereof I affix my signature.A

CHARLES` S. 

